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The P gene of Newcastle disease virus does not encode an accessory X protein

Division of Infectious Diseases, Animal Sciences Group, Wageningen University and Research Centre, PO Box 65, NL-8200 AB Lelystad, The Netherlands

Correspondence
Ben Peeters
ben.peeters{at}wur.nl

Many paramyxoviruses encode non-essential accessory proteins that are involved in the regulation of virus replication and inhibition of cellular antiviral responses. It has been suggested that the P gene mRNA of Newcastle disease virus (NDV) encodes an accessory protein – the so-called X protein – by translation initiation at a conserved in-frame AUG codon at position 120. Using a monoclonal antibody that specifically detected the P and X proteins, it was shown that an accessory X protein was not expressed in NDV-infected cells. Recombinant NDV strains in which the AUG was changed into a GCC (Ala) or GUC (Val) codon were viable but showed a reduction in virulence, probably because the amino acid change affected the function of the P and/or V protein.

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